Asset Monitoring

National Grid uses state of the art technology and systems to minimise the requirement for intrusive maintenance and repair. Our asset monitoring services include:

Site Routine Inspections

We offer routine, non-invasive, non-outage inspections of plant, equipment and site infrastructure.  We agree the schedule of inspections and the frequency with the customer.

After each inspection, we provide the customer with a detailed report on the condition of their High Voltage (HV) assets.  These inspections give peace of mind that plant and equipment are being regularly monitored in line with either National Grid’s own best practice procedures, or to the customer’s own requirements.

SF6 Surveys

We have many years of experience working with and handling SF6 gas (Sulfur Hexafluoride) where it is used as an electrical insulator in high voltage substation equipment. SF6 has approximately 23,900 times the global warming potential compared with CO2. Therefore SF6 leakages are closely monitored under the F Gas Regulations. We have invested in equipment that allows us to pin-point SF6 leaks using thermal imaging technology.  

For more details on this and the full range of SF6 services that we offer, such as thermal imaging, gas handling and top-ups, download our SF6 Services Leaflet.


For information on recent SF6 regulation changes download our SF6 Changes Update.

Overhead Line Condition Monitoring

Our overhead lines team is able to provide a number of services from routine inspections via foot patrols to thermal imaging and condition assessments via helicopter, checking for faults and damage resulting from high winds and adverse weather conditions. The Helicopter Unit is staffed by experienced pilots, observers and camera operators. All of our aircrafts are fitted with the latest gyro stabilised video, thermal imaging and digital recording media.

Data collected during line surveys is collated into professional survey reports, for review by the customer and National Grid, to determine if any further maintenance work is then required.



For information download our Condition Monitoring: Helicopter Surveys Leaflet.

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